The Mariposa County Democratic Central Committee (MCDCC) represents the Democratic Party in Mariposa County. The MCDCC operates under its own by-laws, the California State Elections Code and the by-laws of the California State Democratic Party.

The MCDCC has slots or positions for 23 members distributed amongst the county’s 5 Supervisorial Districts. The number of slots per district is allocated by the State Party in proportion to the number of Democrats that voted for Governor in each Supervisorial District, and thus can change after each Gubernatorial election.